I am trying to find out if I am the only one who has pppd drop packets
as bogus when the port is set at 115Kbps. I only get it at that speed.
It causes stall outs etc.
There may be a possibility this is machine specific, because if it is
meant to forward the packet to the internal net and I slow the machine
down (external cache off) it works fine, turn the cache back on and it
is a problem.
So, anyway, this is an information seeking trip.
Trever
Mark Hahn wrote:
>> There may be a possibility this is machine specific, because if it is
>> meant to forward the packet to the internal net and I slow the machine
>> down (external cache off) it works fine, turn the cache back on and it
>> is a problem.
>
>
> where's the serial port? (isa, pci?) could there be a problem
> with something being overclocked (like >8 MHz ISA, etc)?
> also, is the port's fifo detected and used?
As far as I know the system is not overclocked (standard Digital
Venturis 6200 GL PPro 200 Mhz machine). It is an ISA modem. All info I
have on the port is as follows:
Serial driver version 5.05 (2000-12-13) with MANY_PORTS SHARE_IRQ
SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
cat /proc/ioports
03f8-03ff : serial(auto)
It is a USR 56K Voice/Fax/Modem. I am unable to find the exact model.
It was definitely pre v.90 though I believe it has been updated
(Firmware) to that. I have another, though I don't remember similar
problems even though it was at the same baudrate (different machine though).
Trever Adams
On Sun, 1 Apr 2001, Trever L. Adams wrote:
> I am trying to find out if I am the only one who has pppd drop packets
> as bogus when the port is set at 115Kbps. I only get it at that speed.
> It causes stall outs etc.
>
works fine for me.
Jeff
Actually, I do have a similar problem that I've been unable to track down
100%. Under 2.4.x when I run the modem on my Xircom Cardbus 10/100
Ethernet/56K Modem combo card (installed in a Dell 5000e with 650Mhz Pentium
III) I get a fair number of dropped packets at 115Kbps, enough to cause
problems and a significant speed decrease. Simply dropping the serial port
rate to 56K seems to solve the problem. I'm actually suspicious that the
hardware handshaking isn't working quite right, but I haven't take the time
to look at it.
I never noticed the problem under 2.2.x, but the last kernel I ran from that
era was the 2.2.16 kernel included with Redhat 7. I've really not looked at
it very hard, backing the speed down to 56K was a good enough solution for
me for now, the Xircom has such a troublesome history that I just blamed it
on that but your report makes me more curious.
Later,
Tom
Hi Trever!
On Sun, 01 Apr 2001, Trever L. Adams wrote:
> I am trying to find out if I am the only one who has pppd drop packets
> as bogus when the port is set at 115Kbps. I only get it at that speed.
> It causes stall outs etc.
>
I also have some problems with pppd. At my machine it says sometimes:
Couldn't set tty to PPP discipline: Invalid argument
I'm also using the serial port at 115Kps with a USR Sportster Voice
33.6.
Manfred
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On Sun, 1 Apr 2001, Tom Sightler wrote:
> III) I get a fair number of dropped packets at 115Kbps, enough to cause
> problems and a significant speed decrease. Simply dropping the serial port
> rate to 56K seems to solve the problem.
does the system have IDE disks? (DEC Venturis GL.. should be)
Try hdparm -u on all your IDE disks... should improve things.
> Later,
> Tom
regards,
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